What are some strange and annoying recurrent assumptions that people make about you?

I starve: I'm a thin guy... which makes many people assume I don't eat enough or that I even starve myself. By that logic every fatter person eats sweets all the time, no? But ofc it's not as PC to ask that.

I smoke tobacco: Occasionally some guy asks me if I have a cig or something, and when I say no, they often think I'm lying and that I just don't want to give them one. Yes, because a pack of cigs is literally the only thing I could possibly have in my pockets.

I'm rude: For some reason, being a very quiet and private person that tends to look serious or sad can make some people think you're rude.